1.
the four arithmetic operations
The four basic arithmetic operations: addition, subtraction, multiplication, and division. A grade-school math term.
Refers collectively to 足し算 (addition), 引き算 (subtraction), 掛け算 (multiplication), and 割り算 (division). The 則 means 'rule.'
Compounds
- 四則計算: arithmetic calculation
- 四則演算: arithmetic operations (esp. in math/computing)
- 四則混合: mixed arithmetic (problems combining multiple operations)
Usage
Almost always appears in compounds with 計算 or 演算; rarely used alone in everyday speech.